Nutritionally Enhanced Inbred Maize Line HHA601ND

ABSTRACT

An inbred maize line, designated HHA601ND, is disclosed. The invention relates to the seeds of inbred maize line HHA601ND, to the plants of inbred maize line HHA601ND and to methods for producing a maize plant, either inbred or hybrid, by crossing the inbred line HHA601ND with itself or another maize line. The invention further relates to methods for producing a maize plant containing in its genetic material one or more transgenes and to the transgenic plants produced by that method and to methods for producing other inbred maize lines derived from the inbred HHA601ND.

FIELD OF THE INVENTION

This invention relates to breeding nutritionally enhanced maize,specifically relating to an inbred maize line designated HHA601ND.

BACKGROUND OF THE INVENTION

Over the last fifty years, approaches toward providing animal nutritionhave changed. No longer are the animals fed whatever grain or forage maybe available. Instead, the diets of animals are closely monitored fortotal nutrition value, and for cost. The animal on the diet ismonitored, for quality and performance characteristics, and for theenvironmental impact of the waste from the animal. The informationgathered is employed to adjust the feed to increase nutrition value ofthe feed and the animal performance characteristics while decreasing thecost and environmental impact.

Cereals account for about half of all feed ingredients, primarilybecause they are good sources of energy. Maize tends to be the preferredfeed grain because of its highly digestible carbohydrate and relativelylow fiber content, which is particularly important for swine and poultry(Hard, Proc. Southwest Nutr. Conf. 43-54 (2005)). Because of the lowprotein content of maize, it is common practice to use feed additivesand supplements, such as protein-rich feeds, amino acids, vitamins,minerals and fats in diets for swine and poultry. The ratio of cerealsto supplements has changed through the years in an attempt to maximizefeeding efficiency of the animals. The feeding efficiency (the feedconversion ratio or how much feed is required to produce one pound ofanimal weight) is determined by the genetic potential of the animal andby the nutrients supplied to the animal. As the feed conversion ratiohas risen due to genetic enhancements, the mineral and nutrientrequirements for feed necessary to assure a complete and healthy diethave risen. Since an animal's ability to feed limits the amount ofnutrients and calories it can consume, the feed industry has had todevelop ways to make feeds that have improved protein quality (improvedbalance of essential amino acids), digestibility (fiber, starch,anti-nutrients), and metabolizable energy (oil).

Sources of feed protein have come under global public scrutiny in recentyears because of the bovine spongiform encephalopathy, or mad cowdisease, crisis associated with the feeding of meat and bone meal as theprimary protein source in animal diets in many parts of the world. Plantprotein sources, especially soybean meal, a residual product of the oilextraction process from soybeans relatively high in protein, have becomea dominant alternative protein supplement used in feed following bans onusing meat and bone meal in many parts of the world.

Plant protein sources, however, may lack sufficient levels of essentialamino acids required for adequate animal health, growth and performance.Requirements vary depending on the species and age of the animal. Forexample, the order of the top three limiting amino acids in feedcomposed of corn and soybean meal is lysine, threonine, and tryptophanfor swine and methionine, lysine, and threonine for poultry. (FAO AnimalProduction and Health Proceedings, Protein Sources for the Animal FeedIndustry, xi-xxv, 161-183 (2004)). These limiting amino acids must beavailable at specific minimum levels in order for the animals to usedietary protein efficiently. (Johnson et al. “Identification of ValuableCorn Quality Traits for Livestock Feed”, Report from the Center forCrops Utilization Research, Iowa State University, 1-22 (1999)). Crudeprotein in feed ingredients is not totally digestible for any species,for example corn protein is approximately 84% digestible by poultry and82% digestible by swine (Johnson et al. (1999)). To compensate for thisinefficiency, feed often contains excess protein that then results inhigh nitrogen excretion. More stringent environmental regulations arebeing imposed because high nitrogen excretion poses serious concerns tohuman health through ammonia or nitrate/nitrite pollution in soil andwater. One solution to the problems of nitrogen pollution associatedwith animal feeding is to decrease crude protein in feed andsupplementing feed with amino acids. A one-percentage point reduction incrude protein content in feed can yield about eight to ten percentreduction in nitrogen excretion. (FAO Animal Production and HealthProceedings, Protein Sources for the Animal Feed Industry, 161-183(2004)). Supplementing of feed with amino acids can provide the requirednutrients while decreasing excessive crude protein and can providelimiting amino acids when they are not sufficiently available.

Additionally, animals lack the enzymes necessary to digest thenon-starch based polysaccharides present in soybean meal, andcorn/soybean feed mixtures resulting in high manure volume andenvironmental impact. Approximately 65 to 70% of the total phosphorousin cereal grains is organically bound in phytate phosphorous, which isrelatively unavailable to poultry and swine because they lack the enzymephytase required to digest phytate, thus requiring inorganic phosphoroussupplements. (Knowlton, J. Anim. Sci. 82(E. Suppl.):E173-E195(2004)).The undigested phytate passes through the digestive system and leads toexcretion of excess nutrients resulting in high manure volume and highlevels of phosphorus in manure. Manure containing nitrogen andphosphorous at levels in excess of crop requirements results inenvironmental contamination especially of water resources caused byrunoff. Enzymes, such as phytase, are commonly added to feed to increasedigestibility. The addition of phytase can reduce the level ofphosphorus released in animal waste to about half the previous level.However, the cost of phytase is about three times the cost of theconventional inorganic phosphorous supplements usually added to feed.(“Enhanced Animal Feed Will Be A Boon For The Environment,” EconomicPerspectives, Agricultural Biotechnology, An Electronic Journal of theU.S. Dept. of State, Vol. 8, No. 3, September 2003).

End-users of feed corn include livestock producer-feeders, feedmanufacturers, corn millers and processors. Whether for a livestockproducer-feeder who mixes and prepares their own feed or for a feedmanufacturer who supplies a variety of feed products including completeration feeds or nutrient supplements, each of the various ingredientsnecessary to produce the right combination of nutrients (i.e. protein,amino acids, enzymes, etc.) will need to be transported from site ofproduction and/or processing to the site of the end-user. Theavailability, price, and transportation requirements and costs of eachcomponent of a particular feed will vary from year to year and indifferent geographical regions. Feed is usually formulated to meetnutritional requirements at a minimum dietary cost. The feed industrybalances rations to supply nutrients at the least cost. Because of thevariability of the supply and cost of nutrients and additives, livestockfeeders and feed manufacturers would value corn traits that createsubstitutability for more expensive feedstuffs or additives.

Because feed is around 60% of animal production costs, any savings canbe considerable, especially in large operations. Nutritionally enhancedcorn which can deliver higher levels of important nutrients andmetabolizable energy, and/or enhanced digestibility and bioavailabilityof nutrients would provide the following benefits: reduced feed costsper unit weight gain or production of eggs or milk; reduced animalwaste, particularly nitrogen and phosphorous; reduced veterinary costsand improved disease resistance; improved processing characteristics tomake the feed; and improved quality (Johnson, et al. (1999)). Costsavings can be achieved by using nutritionally enhanced corn through,for example, reduced cost for needed supplements and syntheticadditives, reduced transportation costs associated with the shipping ofeach additive and ingredients to produce the additives, reduced cost inmixing numerous additives during feed processing, and reduced costsassociated with disposal of excess volume of manure.

Both traditional plant breeding and biotechnology techniques have beenused to develop maize plants with desired traits such as low-phytate,high-lysine, or high-oil maize. For example, U.S. Pat. No. 5,723,730describes an inbred corn line used to produce a hybrid with elevatedpercent oil and protein grain.

Examples of grain-based feed that provide improved animal nutrition andcan reduce environmental impact of animal production are described byChang et al. in U.S. Pat. Nos. 7,087,261 and 6,774,288 and in U.S. Publ.No. 2005/0246791.

There remains a need to develop inbred parental maize lines thatcontribute these desirable traits to the hybrids in which they are used.These traits may also include resistance to diseases and insects,tolerance to heat and drought, reducing the time to crop maturity,greater yield, and better agronomic quality. With mechanical harvestingof many crops, uniformity of plant characteristics such as germinationand stand establishment, growth rate, stalk strength, root strength, earretention, maturity and plant and ear height, are important. Selectionof germplasm that possess the desired traits is required to developnovel, desirable plant germplasm for plant breeding.

Maize is an important and valuable field crop. Thus, a continuing goalof plant breeders is to develop stable, high yielding maize hybrids thatare agronomically sound. The reasons for this goal are obviously tomaximize the amount of grain produced on the land used and to supplyfood for both animals and humans. To accomplish this goal, the cornbreeder must select and develop maize plants that have the traits thatresult in superior parental lines for producing hybrids and that provideend-user value.

SUMMARY OF THE INVENTION

This invention provides for a novel inbred maize line designated asHHA601ND and processes for making HHA601ND. This invention relates toseed of inbred maize line HHA601ND, to the plants of inbred maize lineHHA601ND, to plant parts of inbred maize line HHA601ND, and to processesfor making a maize plant that comprise crossing inbred maize lineHHA601ND with another maize plant. The invention also includes the maizeplants produced by the seed of HHA601ND and other plants resulting fromall or part of the genetics of HHA601ND and other resulting hybrids inwhich HHA601ND is one of the parents. In addition, this inventionprovides for a maize plant having the physiological and morphologicalcharacteristics of inbred HHA601ND.

This invention also provides for the tissue cultures of regenerablecells of a plant derived directly from inbred HHA601ND especially wherethe tissue regenerates into plants having all or essentially all of theimportant morphological and physiological characteristics of inbredHHA601ND. The plants regenerated from the tissue culture cells derivedfrom inbred HHA601ND are also a part of this invention.

Inbred seed or hybrid seed produced utilizing the genetic contributionsof a plant or plants derived from inbred HHA601ND are expressly includedin this invention. Parts of the maize plant of the present invention arealso provided, such as e.g., pollen obtained from an inbred plant and anovule of the inbred plant.

This invention further relates to a hybrid maize seed, plant or plantpart produced by crossing the inbred line HHA601ND with another maizeline. This invention also relates to inbred maize lines derived frominbred maize line HHA601ND, to processes for making other inbred maizelines derived from inbred maize line HHA601ND and to the inbred maizelines and their parts derived by the use of those processes.

The invention also relates to methods for producing a maize plantcontaining in its genetic material one or more transgenes and to thetransgenic maize plant produced by that method.

In another aspect, the present invention provides for transformed plantsof HHA601ND. The transferred gene may preferably be a dominant or arecessive allele. Preferably, the transferred gene will confer suchtraits as herbicide resistance, insect resistance, resistance forbacterial, fungal, or viral disease, male fertility, male sterility,abiotic stress resistance/tolerance (e.g., cold tolerance, droughttolerance, etc.), enhanced nutritional quality and industrial usage. Thegene may be a naturally occurring maize gene or a transgene introducedthrough genetic engineering techniques.

The invention further provides for developing a maize plant in a maizeplant breeding program using plant breeding techniques includingrecurrent selection, backcrossing, pedigree breeding, restrictionfragment length polymorphism enhanced selection, genetic marker enhancedselection and transformation, and haploid induction and dihaploidformation. Seed, maize plants, and parts thereof produced by suchbreeding methods are also part of the invention.

Definitions

In the description and tables that follow, a number of terms are used.In order to provide a clear and consistent understanding of thespecification and claims, including the scope to be given such terms,the following definitions are provided:

Allele. The allele is any of one or more alternative forms of a gene,all of which alleles relate to one trait or characteristic. In a diploidcell or organism, the two alleles of a given gene occupy correspondingloci on a pair of homologous chromosomes.

Backcrossing. Backcrossing is a process in which a breeder repeatedlycrosses hybrid progeny back to one of the parents, for example, a firstgeneration hybrid F1 with one of the parental genotypes of the F1hybrid.

Brittle Snap. This is a measure of the stalk breakage near the time ofpollination, and is an indication of whether an inbred or hybrid wouldsnap or break near the time of flowering under severe winds. Data arepresented as percentage of plants that snapped.

Dropped Ears. This is a measure of the number of dropped ears per plot,and represents the percentage of plants that dropped an ear prior toharvest.

% Drop Ears. Dropped Ears. This is a measure of the number of droppedears per plot, and represents the percentage of plants that dropped anear prior to harvest.

Ear Height. The ear height is a measure from the ground to the ear nodeattachment, and is measured in centimeters.

% Early Root Lodging. (See Root Lodging.) The root lodging is thepercentage of plants that root lodge; i.e., those that lean from thevertical axis at an approximate 30° angle or greater would be counted asroot lodged data and is collected at a earlier maturity than the % RootLodging.

Essentially all the physiological and morphological characteristics. Aplant having essentially all the physiological and morphologicalcharacteristics means a plant having the physiological and morphologicalcharacteristics as listed in Table 1 when grown in the sameenvironmental conditions, except for the characteristics derived from asingle or multiple gene conversion.

GDU Pollen. The number of growing degree units (GDUs) or heat unitsrequired for an inbred line or hybrid to have approximately 50 percentof the plants shedding pollen and is measured from the time of planting.Growing degree units are calculated by the Barger Method, where the heatunits for a 24-hour period are:

GDU=[(Max.+Min.)/2]−50.

The highest maximum used is 86° F. and the lowest minimum used is 50° F.For each inbred line and hybrid, it takes a certain number of GDUs toreach various stages of plant development. GDUs are a way of measuringplant maturity.

GDU Silk. The GDU silk (=heat unit silk) is the number of growing degreeunits (GDU) or heat units required for an inbred line or hybrid to reachsilk emergence from the time of planting. Growing degree units arecalculated by the Barger Method, where the heat units for a 24-hourperiod are:

GDU=[(Max.+Min.)/2]−50.

The highest maximum used is 86° F. and the lowest minimum used is 50° F.For each inbred line and hybrid, it takes a certain number of GDUs toreach various stages of plant development. GDUs are a way of measuringplant maturity.

GLS Rating. A 1 to 9 visual rating indicating the resistance to GrayLeaf Spot. A higher score indicates a higher resistance.

% MST=Moisture. The moisture is the actual percentage moisture of thegrain at harvest.

Moisture. The moisture is the actual percentage moisture of the grain atharvest.

NLS Rating. A 1 to 9 visual rating indicating the resistance to NorthernLeaf Spot. A higher score indicates a higher resistance.

% Oil. This is the percentage oil in the maize kernel as measured by NIR(near infrared spectroscopy). Oil is measured by NIR on sib-pollinatedgrain made by hand pollination, which controls the pollen used to makethe kernels and mimics the grain that would be harvested in awhole-field setting. Oil percentage is expressed as acid hydrolysisequivalence (AHE).

Plant Height. This is a measure of the height of the hybrid from theground to the tip of the tassel, and is measured in centimeters.

Pollen Shed. A 1 to 9 visual rating indicating the amount of pollenshed. The higher the score the more pollen shed.

% Protein. This is the percentage protein in the maize kernel asmeasured by NIR (near infrared spectroscopy). Protein is measured by NIRon sib-pollinated grain made by hand pollination, which controls thepollen used to make the kernels and mimics the grain that would beharvested in a whole-field setting.

Quantitative Trait Loci (QTL). Quantitative trait loci (QTL) refer togenetic loci that control to some degree numerically representabletraits that are usually continuously distributed.

Regeneration. Regeneration refers to the development of a plant fromtissue culture.

Root Lodging. The root lodging is the phenotype of plants that rootlodge; i.e., those that lean from the vertical axis at an approximate30° angle or greater.

% Root Lodging. The percentage of plants that root lodge; i.e., thosethat lean from the vertical axis at an approximate 30° angle or greaterwould be counted as root lodged.

Single or Multiple Gene Converted Plant. Single gene converted orconversion plant refers to plants which are developed by a plantbreeding technique called backcrossing wherein essentially all of thedesired morphological and physiological characteristics of an inbred arerecovered in addition to the single gene transferred into the inbred viathe backcrossing technique or via genetic engineering (e.g., planttransformation). More than one gene can be introduced into the plant,e.g., stacked genes in a transformation event, wherein the inbred whilecontaining the newly introduced gene or genes will still retainessentially all of the desired morphological and physiologicalcharacteristics of the inbred as listed in Table 1 when grown in thesame environmental conditions.

Stalk Lodging. This is the percentage of plants that stalk lodge, i.e.,stalk breakage, as measured by either natural lodging or pushing thestalks determining the percentage of plants that break off below theear. This is a relative rating of a hybrid to other hybrids forstandability.

% Starch. This is the percentage starch in the maize kernel as measuredby NIR (near infrared spectroscopy). Starch is measured by NIR onsib-pollinated grain made by hand pollination, which controls the pollenused to make the kernels and mimics the grain that would be harvested ina whole-field setting.

Stay Green. Stay Green is the measure of plant health near the time ofblack layer formation (physiological maturity). A 1 to 9 visual ratingis used, where a higher score indicates better late season plant health.

Tassel Length. Length of the tassel from the flag leaf collar to the tipof the tassel in centimeters.

Tillers. A count of the number of the tillers per plot that couldpossibly shed pollen was taken. Data are given as the average number oftillers per plant.

TestWt. The measure of the weight of the grain in pounds for a givenvolume (bushel) adjusted for 15.5 percent moisture.

Yield BU/A=Yield (Bushels/Acre). The yield in bushels/acre is the actualyield of the grain at harvest adjusted to 15.5% moisture.

Y/M. The yield divided by the percentage moisture (Y/M).

DETAILED DESCRIPTION OF THE INVENTION Characteristics of Inbred MaizeLine HHA601ND

Inbred corn line HHA601ND is a nutritionally-enhanced corn with superiorcharacteristics, and provides an excellent parental line in crosses forproducing first generation (F1) hybrid corn. Inbred corn line HHA601NDis best adapted to climates similar to the Northcentral U.S. Inbred cornline HHA601ND demonstrates good yield, average stay green, above averagepollen shed, good percent oil and protein content, and very goodresistance to root lodging and brittle snap. Inbred corn line HHA601NDhas the morphologic and physiological characteristics described in Table1 (based primarily on data collected at Ames, Iowa).

HHA601ND was developed from the single cross TN7765/TN7713. Some of theselection criteria used in various generations include: yield, stalkquality, root quality, disease tolerance, stay green, ear retention,pollen shedding ability, and silking ability. The inbred was alsoevaluated as a line and in numerous crosses by research stations acrossthe Corn Belt. The inbred has proven to have a very good combiningability in hybrid combinations.

The inbred has shown uniformity and stability. It has beenself-pollinated and ear-rowed a sufficient number of generations, withcareful attention to uniformity of plant type to ensure homozygosity andphenotypic stability. The line has been increased both by hand andsibbed in isolated fields with continued observations for uniformity. Novariant traits have been observed or are expected in HHA601ND.

Maize Hybrids Using HHA601ND

A single cross maize hybrid results from the cross of two inbred lines,each of which has a genotype that complements the genotype of the other.The hybrid progeny of the first generation is designated F1. In thedevelopment of commercial hybrids in a maize plant breeding program,only the F1 hybrid plants are sought. F1 hybrids are more vigorous thantheir inbred parents. This hybrid vigor, or heterosis, can be manifestedin many polygenic traits, including increased vegetative growth andincreased yield. In hybrid combination, inbred HHA601ND demonstratesgood yields with average percent oil and protein content fornutritionally enhanced hybrid. The hybrids also exhibit above averageresistance to Gray Leaf Spot.

HHA601ND may be used to produce hybrid maize. One such embodiment is themethod of crossing inbred maize line HHA601ND with another maize plant,such as a different maize inbred line, to form a first generation F1hybrid seed. The first generation F1 hybrid seed, plant and plant partproduced by this method is an embodiment of the invention. The firstgeneration F1 seed, plant and plant part will comprise an essentiallycomplete set of the alleles of inbred line HHA601ND. One of ordinaryskill in the art can utilize either breeder books or molecular methodsto identify a particular F1 hybrid plant produced using inbred lineHHA601ND. Further, one of ordinary skill in the art may also produce F1hybrids with transgenic, male sterile and/or backcross conversions ofinbred line HHA601ND.

The development of a maize hybrid in a maize plant breeding programinvolves three steps: (1) the selection of plants from various germplasmpools for initial breeding crosses; (2) the selfing of the selectedplants from the breeding crosses for several generations to produce aseries of inbred lines, such as HHA601ND, which, although different fromeach other, breed true and are highly uniform; and (3) crossing theselected inbred lines with different inbred lines to produce thehybrids. During the inbreeding process in maize, the vigor of the linesdecreases, and so one would not be likely to use HHA601ND directly toproduce grain. However, vigor is restored when HHA601ND is crossed to adifferent inbred line to produce a commercial F1 hybrid. An importantconsequence of the homozygosity and homogeneity of the inbred line isthat the hybrid between a defined pair of inbreds may be reproducedindefinitely as long as the homogeneity of the inbred parents ismaintained.

HHA601ND may be used to produce a single cross hybrid, a three-wayhybrid or a double cross hybrid. A single cross hybrid is produced whentwo inbred lines are crossed to produce the F1 progeny. A double crosshybrid is produced from four inbred lines crossed in pairs (A×B and C×D)and then the two F1 hybrids are crossed again (A×B)×(C×D). A three-waycross hybrid is produced from three inbred lines where two of the inbredlines are crossed (A×B) and then the resulting F1 hybrid is crossed withthe third inbred (A×B)×C.

Breeding With Molecular Markers

Molecular markers, which includes markers identified through the use oftechniques such as Isozyme Electrophoresis, Restriction LengthPolymorphisms (RFLPs), Randomly Amplified Polymorphic DNAs (RAPDs),Arbitrarily Primed Polymerase Chain Reaction (AP-PCR), DNA AmplificationFingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs),Amplified Fragment Length Polymorphisms (AFLPs), Simple Sequence Repeats(SSRs), and Single Nucleotide Polymorphisms (SNPs), may be used in plantbreeding methods utilizing the inbred of the present invention.Molecular markers can be used to identify the unique genetic compositionof the invention and progeny lines retaining that unique geneticcomposition. Various molecular marker techniques may be used incombination to enhance overall resolution.

One use of molecular markers is Quantitative Trait Loci (QTL) mapping.QTL mapping is the use of markers, which are known to be closely linkedto alleles that have measurable effects on a quantitative trait.Selection in the breeding process is based upon the accumulation ofmarkers linked to the positive effecting alleles and/or elimination ofthe markers linked to the negative effecting alleles from the plant'sgenome.

Molecular markers can also be used during the breeding process for theselection of qualitative traits. For example, markers closely linked toalleles or markers containing sequences within the actual alleles ofinterest can be used to select plants that contain the alleles ofinterest during a backcrossing breeding program. The markers can also beused to select for the genome of the recurrent parent and can minimizethe amount of genome from the donor parent that remains in the selectedplants. It can also be used to reduce the number of crosses back to therecurrent parent needed in a backcrossing program. The use of molecularmarkers in the selection process is often called genetic marker enhancedselection.

Using HHA601ND in a Breeding Program

This invention is directed to methods for producing a maize plant bycrossing a first parent maize plant with a second parent maize plantwherein either the first or second parent maize plant is an inbred maizeplant of the line HHA601ND. The other parent may be any other maizeplant, such as another inbred line or a plant that is part of asynthetic or natural population. Any such methods using the inbred maizeline HHA601ND are part of this invention: selfing, sibbing, backcrosses,recurrent selection, mass selection, pedigree breeding, double haploids,bulk selection, hybrid production, crosses to populations, and the like.These methods are well known in the art.

For example, pedigree breeding is used commonly for the improvement ofself-pollinating crops or inbred lines of cross-pollinating crops.Pedigree breeding starts with the crossing of two genotypes, such asHHA601ND and one other elite inbred line having one or more desirablecharacteristics that is lacking or which complements HHA601ND. If thetwo original parents do not provide all the desired characteristics,other sources can be included in the breeding population. In thepedigree method, superior plants are selfed and selected in successivefilial generations. In the succeeding filial generations theheterozygous condition gives way to homogeneous lines as a result ofself-pollination and selection.

Mass and recurrent selections can be used to improve populations ofeither self- or cross-pollinating crops. A genetically variablepopulation of heterozygous individuals is either identified or createdby intercrossing several different parents. The best plants are selectedbased on individual superiority, outstanding progeny, or excellentcombining ability. The selected plants are intercrossed to produce a newpopulation in which further cycles of selection are continued.

Backcross breeding has been used to transfer genes for a simplyinherited, highly heritable trait into a desirable homozygous cultivaror inbred line that is the recurrent parent. The source of the trait tobe transferred is called the donor parent. The resulting plant isexpected to have the attributes of the recurrent parent (e.g., cultivar)and the desirable trait transferred from the donor parent. After theinitial cross, individuals possessing the phenotype of the donor parentare selected and repeatedly crossed (backcrossed) to the recurrentparent. The resulting plant is expected to have the attributes of therecurrent parent (e.g., cultivar) and the desirable trait transferredfrom the donor parent.

The production of double haploids can also be used for the developmentof inbreds in the breeding program. For example, an F1 hybrid for whichHHA601ND is a parent can be used to produce double haploid plants.Double haploids are produced by the doubling of a set of chromosomes (1N) from a heterozygous plant to produce a completely homozygousindividual. For example, see Wan et al., “Efficient Production ofDoubled Haploid Plants Through Colchicine Treatment of Anther-DerivedMaize Callus”, Theoretical and Applied Genetics, 77:889 892, 1989 andU.S. patent Ser. No. 10/164,362. This can be advantageous because theprocess omits the generations of selfing needed to obtain a homozygousplant from a heterozygous source.

Thus, an embodiment of this invention is a process for making asubstantially homozygous HHA601ND progeny plant by producing orobtaining a seed from the cross of HHA601ND and another maize plant andapplying double haploid methods to the F1 seed or F1 plant or to anysuccessive filial generation. Such methods decrease the number ofgenerations required to produce an inbred with similar genetics orcharacteristics to HHA601ND.

Descriptions of breeding methods can also be found in one of severalreference books (e.g., Allard, Principles of Plant Breeding, 1960;Simmonds, Principles of Crop Improvement, 1979; Fehr, “Breeding Methodsfor Cultivar Development”, Production and Uses, 2^(nd) ed., Wilcoxeditor, 1987). See also U.S. Pat. No. 7,183,470 and U.S. Pat. No.7,339,097, the disclosures of which are expressly incorporated herein byreference.

Further Embodiments of the Invention

This invention is also directed to methods for producing a maize plantby crossing a first parent maize plant with a second parent maize plant,wherein the first or second maize plant is the inbred maize plant fromthe line HHA601ND. Further, both first and second parent maize plantsmay be from the inbred line HHA601ND. Therefore, any methods using theinbred maize line HHA601ND are part of this invention: selfing,backcrosses, hybrid breeding, and crosses to populations. Any plantsproduced using inbred maize line HHA601ND as a parent are within thescope of this invention. Advantageously, the inbred maize line is usedin crosses with other maize varieties to produce first generation (F1)maize hybrid seed and plants with superior characteristics.

As used herein, the term “plant” includes plant cells, plantprotoplasts, plant cell of tissue culture from which maize plants can beregenerated, plant calli, plant clumps, and plant cells that are intactin plants or parts of plants, such as pollen, flowers, kernels, ears,cobs, leaves, husks, stalks, and the like.

Additionally, the present invention contemplates a maize plantregenerated from a tissue culture of an inbred (e.g., HHA601ND) orhybrid plant of the present invention. As is well known in the art,tissue culture of maize can be used for the in vitro regeneration of amaize plant. By way of example, a process of tissue culturing andregeneration of maize is described in European Patent Application,publication 160,390, the disclosure of which is incorporated byreference. Maize tissue culture procedures are also described in Greenand Rhodes (“Plant Regeneration in Tissue Culture of Maize,” Maize forBiological Research (Plant Molecular Biology Association,Charlottesville, Va. 367-372 (1982)) and Duncan et al. (Planta165:322-332 (1985)). The study by Duncan et al. (1985) indicates that97% of cultured plants produced calli capable of regenerating plants.Subsequent studies have shown that both inbreds and hybrids produced 91%regenerable calli that produced plants.

Other studies indicate that non-traditional tissues are capable ofproducing somatic embryogenesis and plant regeneration. See Songstad etal. (Plant Cell Reports 7:262-265 (1988)); Rao et al. (Maize GeneticsCooperation Newsletter, 60:64-65 (1986)); and Conger et al. (Plant CellReports, 6:345-347 (1987)), the disclosures of which are incorporatedherein by reference. Regenerable cultures may be initiated from immatureembryos as described in PCT publication WO 95/06128, the disclosure ofwhich is incorporated herein by reference.

Thus, another aspect of this invention is to provide for cells that upongrowth and differentiation produce the inbred line HHA601ND.

The advent of new molecular biological techniques has allowed theisolation and characterization of genetic elements with specificfunctions, such as encoding specific protein products or down regulatingthe expression of specific endogenous genes. The genome of plants can beengineered to contain and express foreign genetic elements, oradditional, or modified versions of native or endogenous geneticelements in order to alter the traits of a plant in a specific manner.Any nucleic acid sequences, whether from a different species or from thesame species, which are inserted into the genome using transformationare referred to herein collectively as “transgenes”. In some embodimentsof the invention, a transformed variant of HHA601ND may contain one ormore transgenes. Over the last fifteen to twenty years several methodsfor producing transgenic plants have been developed, and the presentinvention also relates to transformed versions of the claimed inbredmaize line HHA601ND as well as hybrid combinations thereof.

Numerous methods for plant transformation including biological andphysical plant transformation protocols, methods for plant cell ortissue transformation with expression vectors and in vitro culture, andmethods for regeneration of plants are well known in the art, See, forexample, Miki et al., “Procedures for Introducing Foreign DNA intoPlants” in Methods in Plant Molecular Biology and Biotechnology, Glick,B. R. and Thompson, J. E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages67-88; and Armstrong, “The First Decade of Maize Transformation: AReview and Future Perspective” Maydica 44:101 109, 1999). In addition,expression vectors and in vitro culture methods for plant cell or tissuetransformation and regeneration of plants are available. See, forexample, Gruber et al. “Vectors for Plant Transformation” in Methods inPlant Molecular Biology and Biotechnology, Glick, B. R. and Thompson, J.E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages 89-119.

One method for introducing an expression vector into plants is based onthe natural transformation system of Agrobacterium. See, for example,Horsch et al. Science 227:1229 (1985). The Ti and Ri plasmids of A.tumefaciens and A. rhizogenes, respectively, carry genes responsible forgenetic transformation of the plant. See, for example, Kado, C. I.,Crit. Rev. Plant Sci. 10:1 (1991). Descriptions of Agrobacteriummediated gene transfer are provided by Gruber et al., supra, Miki etal., supra, and Moloney et al. Plant Cell Reports 8:238 (1989). Seealso, U.S. Pat. No. 5,591,616, issued Jan. 7, 1997.

A generally applicable method of plant transformation isMicroprojectile-mediated transformation wherein DNA is carried on thesurface of microprojectiles measuring 1 to 4 μm. The expression vectoris introduced into plant tissues with a biolistic device thataccelerates the microprojectiles to speeds of 300 to 600 m/s which issufficient to penetrate plant cell walls and membranes. See, forexample, U.S. Pat. No. 5,240,855; U.S. Pat. No. 5,736,369; U.S. Pat. No.5,886,244; U.S. Pat. No. 6,258,999; U.S. Pat. No. 6,403,865; and U.S.Pat. No. 7,057,089. See also, Sanford et al., Part. Sci. Technol. 5:27(1987), Sanford, J. C., Trends Biotech. 6:299 (1988), Klein et al.,Bio/Technology 6:559-563 (1988), Sanford, J. C., Physiol Plant 7:206(1990), Klein et al., Biotechnology 10:268 (1992). In corn, severaltarget tissues can be bombarded with DNA-coated microprojectiles inorder to produce transgenic plants, including, for example, callus (TypeI or Type II), immature embryos, or meristematic tissue. A method ofcombining microprojectile bombardment with Agrobacterium transformationis described in U.S. Pat. No. 5,932,782, issued Aug. 3, 1999.

The most prevalent types of plant transformation involve theconstruction of an expression vector. Such a vector comprises a DNAsequence that contains a gene or nucleic acid sequence under the controlof or operatively linked to a regulatory element, for example apromoter. The vector may contain one or more genes or nucleic acidsequences and one or more regulatory elements.

One or more genetic traits which have been engineered into the genome ofa particular maize plant or plants using transformation techniques couldbe moved into the genome of another line using traditional breedingtechniques that are well known in the plant breeding arts. For example,a backcrossing approach is commonly used to move a transgene from atransformed maize plant to an elite inbred line, and the resultingprogeny would then comprise the transgene(s). In a single gene convertedplant, the plant would have essentially all the desired morphologicaland physiological characteristics of the inbred in addition to thesingle gene transferred via backcrossing or via genetic engineering.Also, if an inbred line was used for the transformation then thetransgenic plants could be crossed to a different inbred in order toproduce a transgenic hybrid maize plant. In the same manner, more thanone transgene can be transferred into the inbred.

Various genetic elements can be introduced into the plant genome usingtransformation. These elements include, but are not limited to genes;coding sequences; antisense nucleic acid sequences, dsRNA sequences,RNAi sequences, miRNA sequences; inducible, constitutive, and tissuespecific promoters; enhancing sequences; and signal and targetingsequences, which are well known in the art.

With transgenic plants according to the present invention, a foreignprotein can be produced in commercial quantities. Thus, techniques forthe selection and propagation of transformed plants, which are wellunderstood in the art, yield a plurality of transgenic plants that areharvested in a conventional manner, and a foreign protein then can beextracted from a tissue of interest or from total biomass. Proteinextraction from plant biomass can be accomplished by known methods thatare discussed, for example, by Heney and Orr, Anal. Biochem. 114: 92 6(1981).

Likewise, by means of the present invention, plants can be geneticallyengineered to express various phenotypes of agronomic interest. Throughthe transformation of maize the expression of genes can be modulated toenhance disease resistance, insect resistance, herbicide resistance,agronomic, grain quality and other traits. Transformation can also beused to insert DNA sequences which control or help controlmale-sterility. DNA sequences native to maize as well as non-native DNAsequences can be transformed into maize and used to modulate levels ofnative or non-native proteins. Various promoters, targeting sequences,enhancing sequences, and other DNA sequences can be inserted into themaize genome for the purpose of modulating the expression of proteins.Reduction of the activity of specific genes (also known as genesilencing, or gene suppression) is desirable for several aspects ofgenetic engineering in plants.

Exemplary transgenes useful for genetic engineering of inbred maize lineHHA601ND include, but are not limited to, transgenes that conferresistance/tolerance to pests (i.e. insects (such as a transgene thatencodes Bacillus thuringiensis endotoxin), nematodes), diseases, and/ora herbicide (i.e. imidazolinone, sulfonylurea, glyphosate, glufosinate,triazine, dicamba), transgenes that confer or contribute a grain trait(i.e. modified fatty acid metabolism, decreased phytate, modifiedcarbohydrate, improved digestibility), genes that create a site for sitespecific DNA integration, and genes that affect growth characteristicsand/or resistance or tolerance to abiotic stress (e.g., drought and/orheat tolerance, cold tolerance, nitrogen utilization, water useefficiency). These exemplary transgenes and methods for their use inplant transformation are well known to one skilled in the art.

In a further embodiment, a method of introducing a desired trait intomaize inbred line HHA601ND is provided, comprising: (a) crossingHHA601ND plants grown from HHA601ND seed, representative seed of whichhas been deposited under ATCC Accession No. PTA-9431, with plants ofanother maize line that comprise a desired trait to produce F₁ progenyplants; (b) selecting F₁ progeny plants that have the desired trait toproduce selected F₁ progeny plants; (c) crossing the selected progenyplants with the HHA601ND plants to produce backcross progeny plants; (d)selecting for backcross progeny plants that have the desired trait andphysiological and morphological characteristics of maize inbred lineHHA601ND listed in Table 1 to produce selected backcross progeny plants;and (e) repeating steps (c) and (d) one or more times in succession toproduce selected backcross progeny plants that comprise the desiredtrait and all of the physiological and morphological characteristics ofmaize inbred line HHA601ND listed in Table 1 when grown in the sameenvironmental conditions. Plants produced by this method have thedesired trait and all of the physiological and morphologicalcharacteristics of maize inbred line HHA601ND listed in Table 1 whengrown in the same environmental conditions. Exemplary desired traitsare, but are not limited to, herbicide resistance, insect resistance,disease resistance, and decreased phytate. For herbicide resistance, theresistance is conferred, for example, to an herbicide selected from thegroup consisting of imidazolinone, sulfonylurea, glyphosate,glufosinate, triazine, and dicamba. For insect resistance, the insectresistance is conferred, for example, by a transgene encoding a Bacillusthuringiensis endotoxin. Use of a transgene encoding phytase can resultin decrease phytate content.

INDUSTRIAL APPLICABILITY

Maize is used as human food, livestock feed, and as raw material inindustry. The food uses of maize, in addition to human consumption ofmaize kernels, include both products of dry- and wet-milling industries.The principal products of maize dry milling are grits, meal and flour.The maize wet-milling industry can provide maize starch, maize syrups,and dextrose for food use. Maize oil is recovered from maize germ, whichis a by-product of both dry- and wet-milling industries.

Maize, including both grain and non-grain portions of the plant, is alsoused extensively as livestock feed, primarily for beef cattle, dairycattle, hogs, and poultry. See, for example, Chang et al. in U.S. Pat.Nos. 7,087,261 and 6,774,288 and in U.S. Publ. No. 2005/0246791.

Industrial uses of maize include production of ethanol, maize starch inthe wet-milling industry and maize flour in the dry-milling industry.The industrial applications of maize starch and flour are based onfunctional properties, such as viscosity, film formation, adhesiveproperties, and ability to suspend particles. The maize starch and flourhave application in the paper and textile industries. Other industrialuses include applications in adhesives, building materials, foundrybinders, laundry starches, explosives, oil-well muds, and other miningapplications.

Plant parts other than the grain of maize are also used in industry: forexample, stalks and husks are made into paper and wallboard and cobs areused for fuel and to make charcoal.

The seed of inbred maize line HHA601ND, the plant produced from theinbred seed, the hybrid maize plant produced from the crossing of theinbred, hybrid seed, and various parts of the hybrid maize plant andtransgenic versions of the foregoing, can be utilized for human food,livestock feed, and as a raw material in industry.

TABLE 1 VARIETY DESCRIPTION INFORMATION VARIETY = HHA601ND 1. TYPE:Nutritionally-enhanced 2. REGION WHERE DEVELOPED: Northcentral U.S. 3.MATURITY: Days Heat Units From emergence to 50% of plants in silk 691421 From emergence to 50% of plants in pollen 68 1410 Heat Units ={[Max. Temp. (≦86° F.) + Min. Temp (≧50° F.)] − 50}/2 4. PLANT: PlantHeight (to tassel tip) 234 cm Ear Height (to base of top ear) 92 cmAverage Length of Top Ear Internode 13 cm Average number of Tillers 0Average Number of Ears per Stalk 2 Anthocyanin of Brace Roots Faint 5.LEAF: Width of Ear Node Leaf 10 cm Length of Ear Node Leaf 66 cm Numberof leaves above top ear 6 Leaf Angle from 2nd Leaf above ear at anthesisto Stalk above leaf 30° to 60° Leaf Color Medium Green - Munsell 5GY 5/6Leaf Sheath Pubescence (Rate on scale from 1 = none to 9 = like peachfuzz) 4 Marginal Waves (Rate on scale from 1 = none to 9 = many) 6Longitudinal Creases (Rate on scale from 1 = none to 9 = many) 3 6.TASSEL: Number of Lateral Branches 12 Branch Angle from Central SpikeUpright (<30°) Tassel Length (from top leaf collar to tassel top) 36 cmPollen Shed (Rate on scale from 0 = male sterile to 9 = heavy shed) 7Anther Color Light Green - 2.5GY 8/8 Munsell Glume Color Light Green -2.5GY 8/4 Munsell Bar Glumes Absent 7a. EAR: (Unhusked Data) Silk Color(3 days after emergency) Light Green - 2.5GY 8/4 Munsell Fresh HuskColor (25 days after 50% silking) Medium Green - Munsell 5GY 5/6 DryHusk Color (65 days after 50% silking) Buff - Munsell 2.5Y 8/4 Positionof Ear Upright Husk Tightness (Rate on scale from 1 = very loose to 9 =very tight) 6 Husk Extension Medium (<8 cm) 7b. EAR: (Husked Ear Data)Ear Length 14 cm Ear Diameter at mid-point 46 mm Ear Weight 114 gmNumber of Kernel Rows 21 Kernel Rows Distinct Row Alignment StraightShank Length 14 cm Ear Taper Average 8. KERNEL: (Dried) Kernel Length 10mm Kernel Width 8 mm Kernel Thickness 5 mm Round Kernels (Shape Grade)16% Aleurone Color Pattern Homozygous Aleurone Color White - Munsell2.5Y 8/2 Hard Endosperm Color Yellow - Munsell 2.5Y 7/8 Endosperm TypeNormal Starch Weight per 100 kernels 18 gm 9. COB: Cob Diameter atMid-Point 29 mm Cob Color White - Munsell 2.5Y 8/2 10. AGRONOMIC TRAITS:Stay Green (at 65 days after anthesis) (Rate on scale from 1 = worst to9 = excellent) 5 Dropped Ears (at 65 days after anthesis) 0%Pre-anthesis Brittle Snapping 0% Pre-anthesis Root Lodging 0%Post-anthesis Root Lodging (at 65 days after anthesis) 3%

Hybrid Comparisons 2006

The results in Table 2A compare inbred TR7245 crossed to inbred HHA601ND(nutritionally enhanced) and inbred HC33 crossed to inbred TN7713(nutritionally enhanced). The results show the TR7245/HHA601ND hybridproduces significantly higher grain yields than the HC33/TN7713 hybrid.The TR7245/HHA601ND hybrid shows above average percentages for oil (%OIL) and average percentages for protein (% PROTEIN). TheTR7245/HHA601ND hybrid shows above average resistance to Gray Leaf Spot.

The results in Table 2B compare inbred TR7245 crossed to inbred HHA601ND(nutritionally enhanced) and inbred LH332 crossed to inbred TN7713(nutritionally enhanced). The results show that the TR7245/HHA601NDhybrid produces significantly higher grain yields than the LH332/TN7713hybrid. The TR7245/HHA601ND hybrid shows above average percentages foroil (% OIL) and average percentages for protein (% PROTEIN). TheTR7245/HHA601ND hybrid shows above average resistance to Gray Leaf Spot.

The results in Table 2C compare inbred LH245 crossed to inbred HHA601ND(nutritionally enhanced) and inbred LH245 crossed to inbred LH287. Theresults show that the LH245/HHA601ND hybrid produces good grain yields.The LH245/HHA601ND hybrid flowers significantly earlier both GDU POLLENand GDU SILK than the LH245/LH287 hybrid. The LH245/HHA601ND hybridshows average percentages of oil (% OIL) that were significantly higherthan the LH245/LH287 hybrid and average percentages of protein (%PROTEIN). The LH245/HHA601ND hybrid shows above average resistance toGray Leaf Spot.

The results in Table 2D compare inbred LH244 crossed to inbred HHA601ND(nutritionally enhanced) and inbred LH331 crossed to inbred LH283. Theresults show that the LH244/HHA601ND hybrid produces grain yields thatwere not significantly different than the LH331/LH283 hybrid. TheLH244/HHA601ND hybrid flowers significantly earlier both GDU POLLEN andGDU SILK than the LH331/LH283 hybrid. The LH244/HHA601ND hybrid showsaverage percentages of oil (% OIL) that were significantly higher thanthe LH331/LH283 hybrid. The LH244/HHA601ND hybrid shows above averageresistance to Gray Leaf Spot.

TABLE 2A INBREDS IN HYBRID COMBINATION REPORT 2006 VARIETY #1 =TR7245/HHA601ND VARIETY #2 = HC33/TN7713 GDU GDU PLANT Yield BU/A % MSTTESTWT POLLEN SILK HEIGHT TOTAL SUM TR7245/HHA601ND 200.7 22.0 55.31363.2 1404.9 97 HC33/TN7713 181.7 20.2 56.1 1388.2 1402.2 94 #Compares19 19 18 5 5 4 Difference 19.0 1.8 −0.8 −25.0 2.7 3 p-value 0.01 0.000.00 0.09 0.88 0.05 % % EAR ROOT STALK % DROP STAY HEIGHT LODGINGLODGING EARS GREEN % OIL TOTAL SUM TR7245/HHA601ND 46 10.2 7.4 0.0 NA6.2 HC33/TN7713 39 6.0 4.8 0.0 NA 6.0 #Compares 4 18 18 18 NA 4Difference 7 4.2 2.6 0.0 NA 0.2 p-value 0.03 0.29 0.35 1.00 NA 0.46 % %GLS NLS PROTEIN STARCH RATING RATING TOTAL SUM TR7245/HHA601ND 11.4 68.87 NA HC33/TN7713 10.6 69.4 6 NA #Compares 4 4 3 NA Difference 0.8 −0.6 1NA p-value 0.12 0.11 0.42 NA

TABLE 2B INBREDS IN HYBRID COMBINATION REPORT 2006 VARIETY #1 =TR7245/HHA601ND VARIETY #2 = LH332/TN7713 GDU GDU PLANT Yield BU/A % MSTTESTWT POLLEN SILK HEIGHT TOTAL SUM TR7245/HHA601ND 201.1 22.0 55.21363.2 1404.9 97 LH332/TN7713 189.3 20.0 56.3 1366.3 1389.5 92 #Compares19 19 18 5 5 4 Difference 11.8 2.0 −1.1 −3.1 15.4 5 p-value 0.02 0.000.00 0.71 0.03 0.04 % % EAR ROOT STALK % DROP STAY HEIGHT LODGINGLODGING EARS GREEN % OIL TOTAL SUM TR7245/HHA601ND 46 10.6 8.0 0.0 NA6.2 LH332/TN7713 39 9.3 3.4 0.0 NA 5.9 #Compares 4 18 18 18 NA 4Difference 7 1.3 4.6 0.0 NA 0.3 p-value 0.05 0.57 0.19 1.00 NA 0.14 % %GLS NLS PROTEIN STARCH RATING RATING TOTAL SUM TR7245/HHA601ND 11.4 68.87 NA LH332/TN7713 10.4 69.7 6 NA #Compares 4 4 3 NA Difference 1.0 −0.91 NA p-value 0.19 0.13 0.23 NA

TABLE 2C INBREDS IN HYBRID COMBINATION REPORT 2006 VARIETY #1 =LH245/HHA601ND VARIETY #2 = LH245/LH287 GDU GDU PLANT Yield BU/A % MSTTESTWT POLLEN SILK HEIGHT TOTAL SUM LH245/HHA601ND 185.1 18.5 56.61398.8 1423.6 97 LH245/LH287 186.8 18.1 56.5 1456.5 1482.0 89 #Compares20 20 15 5 5 3 Difference −1.7 0.4 0.0 −57.7 −58.4 8 p-value 0.73 0.170.94 0.00 0.01 0.06 % % EAR ROOT STALK % DROP STAY HEIGHT LODGINGLODGING EARS GREEN % OIL TOTAL SUM LH245/HHA601ND 45 1.3 12.7 0.0 NA 5.5LH245/LH287 40 0.9 8.9 0.0 NA 4.8 #Compares 3 19 20 18 NA 4 Difference 50.3 3.9 0.0 NA 0.7 p-value 0.08 0.55 0.24 1.00 NA 0.01 % % GLS NLSPROTEIN STARCH RATING RATING TOTAL SUM LH245/HHA601ND 11.2 69.9 6 NALH245/LH287 10.2 71.5 5 NA #Compares 4 4 9 NA Difference 0.9 −1.6 1 NAp-value 0.14 0.03 0.07 NA

TABLE 2D INBREDS IN HYBRID COMBINATION REPORT 2006 VARIETY #1 =LH244/HHA601ND VARIETY #2 = LH331/LH283 GDU GDU PLANT Yield BU/A % MSTTESTWT POLLEN SILK HEIGHT TOTAL SUM LH244/HHA601ND 179.4 18.1 56.61393.7 1408.8 94 LH331/LH283 187.1 17.3 57.3 1469.8 1474.8 90 #Compares20 20 15 5 5 3 Difference −7.7 0.8 −0.7 −76.1 −66.0 4 p-value 0.15 0.000.00 0.00 0.00 0.16 % % EAR ROOT STALK % DROP STAY HEIGHT LODGINGLODGING EARS GREEN % OIL TOTAL SUM LH244/HHA601ND 43 1.1 11.1 0.0 NA 5.9LH331/LH283 43 1.6 6.8 0.1 NA 5.3 #Compares 3 19 20 18 NA 4 Difference 0−0.5 4.3 −0.1 NA 0.6 p-value 1 0.78 0.03 0.33 NA 0.02 % % GLS NLSPROTEIN STARCH RATING RATING TOTAL SUM LH244/HHA601ND 10.5 69.9 7 NALH331/LH283 11.1 70.3 7 NA #Compares 4 4 9 NA Difference −0.6 −0.4 0 NAp-value 0.13 0.31 0.45 NA

Hybrid Comparisons 2007

The results in Table 3A compare inbred TR7169BT11 crossed to inbredHHA601ND (nutritionally enhanced) and hybrid P34A15. The results showthat TR7169BT11/HHA601ND hybrid produces grain yields that were notsignificantly different than the P34A15 hybrid. The TR7169BT11/HHA601NDhybrid shows similar flowering dates both GDU POLLEN and GDU SILK to theP34A15 hybrid and that were not significantly different. TheTR7169BT11/HHA601ND hybrid shows above average percentages of oil (%OIL) and above average percentages of protein (% PROTEIN). TheTR7169BT11/HHA601ND also demonstrates above average Stay Green and aboveaverage resistance to Gray Leaf Spot.

The results in Table 3B compare inbred TR7169BT11 crossed to inbredHHA601ND (nutritionally enhanced) and inbred LH332CRW2 crossed to inbredTN7713 (nutritionally enhanced). The results show theTR7169BT11/HHA601ND hybrid produces significantly higher grain yieldsthan the LH332CRW2/TN7713 hybrid. The TR7169BT11/HHA601ND flowerssignificantly earlier (GDU SILK) than the LH332CRW2/TN7713 hybrid. TheTR7169BT11/HHA601ND hybrid shows above average percentages of oil (%OIL) and protein (% PROTEIN).

The results in Table 3C compare inbred TR7169BT11 crossed to inbredHHA601ND (nutritionally enhanced) and inbred SGI890HX1 crossed to inbredHHA601ND (nutritionally enhanced). The results show TR7169BT11/HHA601NDhybrid produces significantly higher grain yields than theSGI890HX1/HHA601ND hybrid. The TR7169BT11/HHA601ND flowers significantlyearlier (GDU SILK) than the SGI890HX1/HHA601ND hybrid. TheTR7169BT11/HHA601ND hybrid shows above average percentages of oil (%OIL) that were significantly higher than the SGI890HX1/HHA601ND hybrid.The TR7169BT11/HHA601ND hybrid shows above average percentages forprotein (% PROTEIN).

The results in Table 3D compare inbred TR7169BT11 crossed to inbredHHA601ND (nutritionally enhanced) and inbred TR6467BT11 crossed toinbred TR7392. The results show TR7169BT11/HHA601ND hybrid produces goodgrain yields. The TR7169BT11/HHA601ND hybrid has similar flowering datesboth GDU POLLEN and GDU SILK to the TR6467BT11/TR7392 hybrid. TheTR7169BT11/HHA601ND hybrid shows above average percentages of oil (%OIL) that were significantly higher than the TR6467BT11/TR7392 hybrid.The TR7169BT11/HHA601ND hybrid shows above average percentages ofprotein (% PROTEIN).

TABLE 3A INBREDS IN HYBRID COMBINATION REPORT 2007 VARIETY #1 =TR7169BT11/HHA601ND VARIETY #2 = P34A15 GDU GDU PLANT Yield BU/A % MSTTESTWT POLLEN SILK HEIGHT TOTAL SUM TR7169BT11/HHA601ND 199.1 21.4 54.21342.3 1342.3 111 P34A15 200.3 18.8 55.6 1307.7 1311.7 93 #Compares 2020 19 3 3 3 Difference −1.2 2.6 −1.3 34.7 30.7 18 p-value 0.84 0.00 0.000.12 0.22 0.06 % % EAR ROOT STALK % DROP STAY HEIGHT LODGING LODGINGEARS GREEN % OIL TOTAL SUM TR7169BT11/HHA601ND 60 2.6 8.7 0.1 7 6.2P34A15 41 0.0 0.2 0.0 4 5.7 #Compares 3 20 20 20 2 3 Difference 19 2.68.5 0.1 3 0.6 p-value 0 0.08 0.01 0.33 0.61 0.28 % % GLS NLS PROTEINSTARCH RATING RATING TOTAL SUM TR7169BT11/HHA601ND 11.7 68.6 6 NA P34A159.8 71.0 4 NA #Compares 3 3 1 NA Difference 1.9 −2.4 2 NA p-value 0.180.16 NA NA

TABLE 3B INBREDS IN HYBRID COMBINATION REPORT 2007 VARIETY #1 =TR7169BT11/HHA601ND VARIETY #2 = LH332CRW2/TN7713 GDU GDU PLANT YieldBU/A % MST TESTWT POLLEN SILK HEIGHT TOTAL SUM TR7169BT11/HHA601ND 199.121.4 54.2 1342.3 1342.3 111 LH332CRW2/TN7713 182.3 19.3 55.0 1341.01366.7 105 #Compares 20 20 19 3 3 3 Difference 16.8 2.1 −0.8 1.3 −24.3 6p-value 0.01 0.00 0.01 0.92 0.02 0.23 % % EAR ROOT STALK % DROP STAYHEIGHT LODGING LODGING EARS GREEN % OIL TOTAL SUM TR7169BT11/HHA601ND 602.6 8.7 0.1 7 6.2 LH332CRW2/TN7713 51 4.6 9.3 0.0 4 6.2 #Compares 3 2020 20 2 3 Difference 9 −2.0 −0.6 0.1 3 0.1 p-value 0.04 0.57 0.86 0.330.13 0.75 % % GLS NLS PROTEIN STARCH RATING RATING TOTAL SUMTR7169BT11/HHA601ND 11.7 68.6 6 NA LH332CRW2/TN7713 11.7 68.5 5 NA#Compares 3 3 1 NA Difference 0.0 0.0 1 NA p-value 0.96 0.93 NA NA

TABLE 3C INBREDS IN HYBRID COMBINATION REPORT 2007 VARIETY #1 =TR7169BT11/HHA601ND VARIETY #2 = SGI890HX1/HHA601ND GDU GDU PLANT YieldBU/A % MST TESTWT POLLEN SILK HEIGHT TOTAL SUM TR7169BT11/HHA601ND 199.121.4 54.2 1342.3 1342.3 111 SGI890HX1/HHA601ND 186.7 19.6 54.8 1363.31366.7 98 #Compares 20 20 19 3 3 3 Difference 12.4 1.8 −0.5 −21.0 −24.314 p-value 0.00 0.00 0.03 0.19 0.02 0.04 % % EAR ROOT STALK % DROP STAYHEIGHT LODGING LODGING EARS GREEN % OIL TOTAL SUM TR7169BT11/HHA601ND 602.6 8.7 0.1 7 6.2 SGI890HX1/HHA601ND 50 0.2 2.3 0.5 6 5.5 #Compares 3 2020 20 2 3 Difference 10 2.4 6.4 −0.4 1 0.8 p-value 0.04 0.10 0.05 0.510.5 0.02 % % GLS NLS PROTEIN STARCH RATING RATING TOTAL SUMTR7169BT11/HHA601ND 11.7 68.6 6 NA SGI890HX1/HHA601ND 11.3 69.7 6 NA#Compares 3 3 1 NA Difference 0.3 −1.1 0 NA p-value 0.40 0.10 NA NA

TABLE 3D INBREDS IN HYBRID COMBINATION REPORT 2007 VARIETY #1 =TR7169BT11/HHA601ND VARIETY #2 = TR6467BT11/TR7392 GDU GDU PLANT YieldBU/A % MST TESTWT POLLEN SILK HEIGHT TOTAL SUM TR7169BT11/HHA601ND 198.021.2 54.2 1342.3 1342.3 111 TR6467BT11/TR7392 195.5 19.2 54.7 1334.01345.7 103 #Compares 19 19 19 3 3 3 Difference 2.5 2.0 −0.5 8.3 −3.3 8p-value 0.77 0.00 0.12 0.82 0.95 0.13 % % EAR ROOT STALK % DROP STAYHEIGHT LODGING LODGING EARS GREEN % OIL TOTAL SUM TR7169BT11/HHA601ND 602.7 9.2 0.2 7 6.2 TR6467BT11/TR7392 55 0.1 1.3 0.0 9 5.2 #Compares 3 1919 19 2 3 Difference 5 2.6 7.9 0.2 −2 1.0 p-value 0 0.09 0.02 0.33 0.50.02 % % GLS NLS PROTEIN STARCH RATING RATING TOTAL SUMTR7169BT11/HHA601ND 11.7 68.6 6 NA TR6467BT11/TR7392 10.8 70.4 7 NA#Compares 3 3 1 NA Difference 0.8 −1.9 −1   NA p-value 0.45 0.11 NA NA

Deposit Information

Inbred seeds of HHA601ND have been placed on deposit with the AmericanType Culture Collection (ATCC), Manassas, Va., under Deposit AccessionNumber PTA-9431 on Aug. 26, 2008.

All publications, patents and patent applications mentioned in thespecification are indicative of the level of those skilled in the art towhich this invention pertains. All such publications, patents and patentapplications are incorporated by reference herein for the purpose citedto the same extent as if each was specifically and individuallyindicated to be incorporated by reference herein.

Although the foregoing invention has been described in some detail byway of illustration and example for purposes of clarity andunderstanding, it will be obvious that certain changes and modificationsmay be practiced within the scope of the invention, as limited only bythe scope of the appended claims.

1. Seed of maize inbred line designated HHA601ND, representative seed ofsaid line having been deposited under ATCC Accession No. PTA-9431.
 2. Amaize plant, or a part thereof, produced by growing the seed of claim 1.3. Pollen of the plant of claim
 2. 4. An ovule of the plant of claim 2.5. The maize plant of claim 2 wherein said plant has been detasseled oris male sterile.
 6. A tissue culture of regenerable cells produced fromthe plant of claim
 2. 7. The tissue culture of claim 6, wherein cells ofthe tissue culture are from a tissue selected from the group consistingof leaf, pollen, embryo, root, root tip, anther, silk, flower, kernel,ear, cob, husk, and stalk.
 8. A protoplast produced from the tissueculture of claim
 6. 9. A maize plant regenerated from the tissue cultureof claim 6, wherein the regenerated plant has all the morphological andphysiological characteristics of inbred line HHA601N, representativeseed of said line having been deposited under ATCC Accession No.PTA-9431.
 10. A method for producing a hybrid maize seed comprisingcrossing a first inbred parent maize plant with a second inbred parentmaize plant and harvesting the resultant hybrid maize seed, wherein saidfirst inbred parent maize plant or second said parent maize plant is themaize plant of claim
 2. 11. A hybrid maize seed produced by the methodof claim
 10. 12. A maize plant, or a part thereof, produced by growingthe seed of claim
 11. 13. A method for producing a HHA601ND-derivedmaize plant, comprising: (a) crossing inbred maize line HHA601ND,representative seed of said line having been deposited under ATCCaccession No. PTA-9431, with a second maize plant to yield progeny maizeseed; and (b) growing said progeny maize seed, under plant growthconditions, to yield said HHA601ND-derived maize plant.
 14. The methodof claim 13, further comprising: (c) crossing said HHA601ND-derivedmaize plant with itself or another maize plant to yield additionalHHA601ND-derived progeny maize seed; (d) growing said progeny seed ofstep (c) under plant growth conditions to yield additionalHHA601ND-derived maize plants; and (e) repeating the crossing andgrowing steps of (c) and (d) from 0 to 7 times to generate furtherHHA601ND-derived maize plants.
 15. A HHA601ND-derived maize plantproduced by the method of claim
 14. 16. A maize plant produced by themethod of claim
 13. 17. A method for producing a nutritionally enhancedhybrid maize seed comprising crossing a first inbred parent maize plantwith a second inbred parent maize plant and harvesting the resultanthybrid maize seed, wherein said first inbred parent maize plant orsecond said parent maize plant is the maize plant of claim
 2. 18. Ahybrid maize seed produced by the method of claim
 17. 19. A maize plant,or a part thereof, produced by growing the seed of claim
 18. 20. Themaize plant of claim 2 further comprising a transgene which confersresistance to an herbicide.
 21. The maize plant of claim 20 wherein theherbicide is selected from the group consisting of imidazolinone,sulfonylurea, glyphosate, glufosinate, triazine, and dicamba.
 22. Themaize plant of claim 2 further comprising a transgene that confersinsect resistance.
 23. The maize plant of claim 22, wherein thetransgene encodes a Bacillus thuringiensis endotoxin.
 24. The maizeplant of claim 2 further comprising a transgene that confers diseaseresistance.
 25. The maize plant of claim 2 further comprising atransgene encoding a phytase.
 26. A method of introducing a desiredtrait into maize inbred line HHA601ND comprising: (a) crossing HHA601NDplants grown from HHA601ND seed, representative seed of which has beendeposited under ATCC Accession No. PTA-9431, with plants of anothermaize line that comprise a desired trait to produce F₁ progeny plants;(b) selecting F₁ progeny plants that have the desired trait; (c)crossing the selected progeny plants with the HHA601ND plants to producebackcross progeny plants; (d) selecting for backcross progeny plantsthat have the desired trait and physiological and morphologicalcharacteristics of maize inbred line HHA601ND listed in Table 1 toproduce selected backcross progeny plants; and (e) repeating steps (c)and (d) one or more times in succession to produce selected backcrossprogeny plants that comprise the desired trait and substantially all ofthe physiological and morphological characteristics of maize inbred lineHHA601ND listed in Table 1 when grown in the same environmentalconditions.
 27. A plant produced by the method of claim 26, wherein theplant has the desired trait and substantially all of the physiologicaland morphological characteristics of maize inbred line HHA601ND listedin Table 1 when grown in the same environmental conditions.
 28. Theplant of claim 27, wherein the desired trait is selected from the groupconsisting of stress tolerance, herbicide resistance, insect resistance,nematode resistance, disease resistance, and decreased phytate.
 29. Theplant of claim 27, wherein the desired trait is herbicide resistance andthe resistance is conferred to an herbicide selected from the groupconsisting of imidazolinone, sulfonylurea, glyphosate, glufosinate,triazine, and dicamba.
 30. The plant of claim 27, wherein the desiredtrait is insect resistance and the insect resistance is conferred by atransgene encoding a Bacillus thuringiensis endotoxin.
 31. A maizeplant, or a part thereof, having all of the physiological andmorphological characteristics of maize inbred line HHA601ND, wherein asample of the seed of maize inbred line HHA601ND was deposited underATCC Accession NO. PTA-9431.
 32. A method of producing a maize plantcomprising the steps of: (a) growing a progeny plant produced bycrossing the plant of claim 31 with a second maize plant; (b) crossingthe progeny plant with itself or a different plant to produce a seed ofprogeny plant of a subsequent generation; (c) growing a progeny plant ofa subsequent generation from said seed and crossing the progeny plant ofa subsequent generation with itself or a different plant; and (d)repeating steps (b) and (e) for an additional 0-5 generation to producea maize plant.
 33. The method of claim 32 wherein the produced maizeplant is an inbred maize plant.
 34. The method of claim 33, furthercomprising the step of crossing the inbred maize plant with a second,distinct inbred maize plant to produce an F1 hybrid maize plant.
 35. Amethod for developing a second maize plant in a maize plant breedingprogram comprising applying plant breeding techniques to a first maizeplant, or parts thereof, wherein said first maize plant is the maizeplant of claim 31, and wherein application of said techniques results indevelopment of said second maize plant.
 36. The method for developing amaize plant in a maize plant breeding program of claim 35 wherein plantbreeding techniques are selected from the group consisting of recurrentselection, backcrossing, pedigree breeding, restriction lengthpolymorphism enhanced selection, genetic marker enhanced selection, andtransformation.
 37. A method of plant breeding comprising the steps of:(a) obtaining the molecular marker profile of maize inbred lineHHA601ND, representative seed of said line having been deposited underATCC Accession No. PTA-9431; (b) obtaining an F1 hybrid seed for whichthe maize plant of claim 31 is a parent; (c) crossing a plant grown fromthe F1 hybrid seed with a different maize plant; and (d) selectingprogeny that retain the molecular marker profile of HHA601ND.